He didn't do it, although it was necessary - I should have phoned my mum on her birthday, He did it, although it wasn't necessary - You needn't have bought a ticket, because we had an extra one, He did it but it was the wrong thing to do - He ought not to have shouted at his neighbour, He didn't do it, because it became unnecessary - Jim drove me to work, so I didn't have to walk, He didn't have the ability to do it - He couldn't/wasn't able to play football until his leg healed, He didn't do it, because it wasn't necessary - He didn't need to go to the supermarket, because his wife had already done the shopping,

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